“He’s been sick for many many years and he needs help and he’s going to hurt someone else again, mark my words,” John Anderson said while standing next to his sister, Patty and brother Jerry, in a fourth-floor hallway at the Stamford courthouse. “He’s a danger. If he did that to his mother, he would do that to anyone else on the street.”

Anderson’s siblings have complained their brother’s probation officer was not supervising him closely enough and his probation should have been violated before he laid hands on his mother.

“This is one of those horrific situations where he should have had psychiatric treatment all along,” Anderson’s public defender Howard Ehring said. “The family provided it for him, but he did not feel like he needed it and it had tragic consequences at the end.”

Police said Anderson snapped on March 23, 2015 when his mother discovered he was not taking his medication. Anderson grabbed his mother by the collar with one hand and punched her repeatedly in the face with the other inside the Sleepy Hollow Lane home they shared, police said.

Maryann Anderson was taken to Stamford Hospital, where she went into a coma and was later taken off life support.

The murder charge was reduced to first-degree manslaughter when it was determined Anderson did not intend to kill his mother.

Comerford said Anderson suffered for more than a dozen years with psychiatric issues that included paranoia, disorientation, responses to internal stimuli and aggression.

Anderson was “actively psychotic,” which impaired his judgment when he killed his mother, Comerford said.